make alibaba exception accept nullable subMessage and subCode

src/Endpoint/CategoryEndpoint.php

@@ -77,8 +77,11 @@ public function getAttributes(string $categoryId): array
      *
      * @param ?string $valueId provide null to fetch first level
      */
-    public function getLevelAttribute(string $categoryId, string $attributeId, ?string $valueId = null): CategoryLevelAttribute
-    {
+    public function getLevelAttribute(
+        string $categoryId,
+        string $attributeId,
+        ?string $valueId = null
+    ): CategoryLevelAttribute {
         $attributeValueRequest = new CategoryLevelAttributeRequest();
         $attributeValueRequest->categoryId = $categoryId;
         $attributeValueRequest->attributeId = $attributeId;

src/Exception/AlibabaException.php

@@ -12,8 +12,8 @@ class AlibabaException extends \RuntimeException
     public function __construct(
         string $message,
         int $code,
-        private string $subMessage,
-        private string $subCode,
+        private ?string $subMessage,
+        private ?string $subCode,
         ?\Throwable $previous = null
     ) {
         $message = sprintf('%s. Sub-code: "%s". Sub-message: "%s".', $message, $this->subCode, $this->subMessage);

src/Factory/CategoryFactory.php

@@ -81,7 +81,7 @@ public function createAttributeValue(array $data): CategoryAttributeValue
     }
 
     /**
-     * @param array<string, mixed> $data
+     * @param <string, mixed> $data
      */
     public function createLevelAttribute(array $data): CategoryLevelAttribute
     {

src/Model/CategoryAttribute.php

@@ -12,7 +12,9 @@ class CategoryAttribute
 
     // TODO: change to enums once all values would be known
     public string $inputType; // Known values: single_select, multi_select, input
-    public string $showType; // Known values: list_box (single_select), check_box (multi_select), input (input), group_table (single_select)
+
+    // Known values: list_box (single_select), check_box (multi_select), input (input), group_table (single_select)
+    public string $showType;
     public string $valueType; // Known values: string, number
 
     public bool $isSku;